Frequency meter and P.F. meter

Voltmeter and frequency meter

Voltmeter and power factor meter

Wattmeter and voltmeter

avoid overloading the resistor when measuring its voltage

avoid inaccuracy when the temperature changes

keep the measurement error small due to the internal consumption (voltage drop) of the meter

prevent the meter from overloading

To adjust the sensitivity of the meter

To correct the zero position of the pointer

To tight the moving part of the meter

To change the measuring range of the meter

1000

5000

50000

50

2

3

4

5